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+//caption:stability_using_Nyquist_criterion
+//example 11_25
+//page 497
+clf();
+s=%s;
+s1=-s;
+g=(2.2/(s*(s+1)*(s^2+2*s+2)))
+g1=(2.2/(s1*(s1+1)*(s1^2+2*s1+2)))
+GH=syslin('c',g);
+GH1=syslin('c',g1);
+nyquist(GH);
+nyquist(GH1);
+mtlb_axis([-2.5 0.2 -75 75]);
+disp("as the nyquist plot passes through the point -1+%i*0, so system is marginally stable and output represents sustained oscillations.")
+\ No newline at end of file